Löhner-Böttcher, J.; Schmidt, W.; Doerr, H.-P.; Kentischer, T.; Steinmetz, T.; Probst, R. A.; Holzwarth, R.: LARS: An Absolute Reference Spectrograph for solar observations. Upgrade from a prototype to a turn-key system. Astronomy and Astrophysics 607, A12 (2017)
Doerr, H.-P.; Vitas, N.; Fabbian, D.: How different are the Liège and Hamburg atlases of the solar spectrum? Astronomy and Astrophysics 590, A118 (2016)
Lagg, A.; Solanki, S. K.; Doerr, H.-P.; Martínez González, M. J.; Riethmüller, T.; Collados Vera, M.; Schlichenmaier, R.; Orozco Suárez, D.; Franz, M.; Feller, A.et al.; Kuckein, C.; Schmidt, W.; Asensio Ramos, A.; Pastor Yabar, A.; von der Lühe, O.; Denker, C.; Balthasar, H.; Volkmer, R.; Staude, J.; Hofmann, A.; Strassmeier, K.; Kneer, F.; Waldmann, T.; Borrero, J. M.; Sobotka, M.; Verma, M.; Louis, R. E.; Rezaei, R.; Soltau, D.; Berkefeld, T.; Sigwarth, M.; Schmidt, D.; Kiess, C.; Nicklas, H.: Probing deep photospheric layers of the quiet Sun with high magnetic sensitivity. Astronomy and Astrophysics 596, A6 (2016)
Martínez González, M. J.; Pastor Yabar, A.; Lagg, A.; Asensio Ramos, A.; Collados, M.; Solanki, S. K.; Balthasar, H.; Berkefeld, T.; Denker, C.; Doerr, H. P.et al.; Feller, A.; Franz, M.; González Manrique, S. J.; Hofmann, A.; Kneer, F.; Kuckein, C.; Louis, R.; von der Lühe, O.; Nicklas, H.; Orozco, D.; Rezaei, R.; Schlichenmaier, R.; Schmidt, D.; Schmidt, W.; Sigwarth, M.; Sobotka, M.; Soltau, D.; Staude, J.; Strassmeier, K. G.; Verma, M.; Waldman, T.; Volkmer, R.: Inference of magnetic fields in the very quiet Sun. Astronomy and Astrophysics 596, A5 (2016)
Roth, M.; Doerr, H.-P.; Hartlep, T.: Verification of the helioseismic Fourier-Legendre analysis for meridional flow measurements. Astronomy and Astrophysics 592, A106 (2016)
Caffau, E.; Ludwig, H.-G.; Steffen, M.; Livingston, W.; Bonifacio, P.; Malherbe, J.-M.; Doerr, H.-P.; Schmidt, W.: The photospheric solar oxygen project. III. Investigation of the centre-to-limb variation of the 630 nm [O I]-Ni I blend. Astronomy and Astrophysics 579, A88 (2015)
Doerr, H.-P.; The Sunrise Team: The Sunrise III Mission. Solarnet IV Meeting "The physics of the Sun from the interior to the outer atmosphere" , Lanzarote, Spain (2017)
Doerr, H.-P.; Iglesias, F.; Lagg, A.; van Noort, M.; The GRIS+ Tteam: GRIS+ - Instrument Setup and First Data. GREGOR technical development meeting, Potsdam, Germany (2017)
Doerr, H.-P.; van Noort, M.: Progress of workpackage 4.2: spectro-polarimetry using a microlens-fed spectrograph. GREST Board Meeting, Rome, Italy (2017)
van Noort, M.; Doerr, H.-P.: Status of work-package 4.2: spectropolarimetry using a microlens-fed spectrograph. GREST board meeting, Brussels, Belgium (2017)
van Noort, M.; Feller, A.; de la Cruz-Rodriguez, J.; Doerr, H.-P.; Kiselman, D.: Image restoration of polarimetric spectrograph data. SOLARNET IV: The Physics of the Sun from the Interior to the Outer Atmosphere , Lanzarote, Spain (2017)
van Noort, M.; Feller, A.; Iglesias, F. A.; Doerr, H.-P.: Image restoration with a grating spectro-polarimeter at the SST and plans for GREGOR/GRIS. 2nd GREGOR/SOLARNET science meeting, Göttingen, Germany (2016)
Doerr, H.-P.: Can we still learn something from spatially unresolved high-precision spectroscopy of the solar photosphere? Colloquium, Kiepenheuer-Institut für Sonnenphysik, Freiburg, Germany (2015)
The Planetary Plasma Environments group (PPE) has a strong heritage in the exploration of planetary magnetospheres and space plasma interactions throughout the solar system. It has contributed instruments to several past missions that flew-by or orbited Jupiter (Galileo, Cassini, Ulysses). The PPE participates in the JUICE mission by contributing hardware and scientific expertise to the Particle Environment Package (PEP).
Analyzing the high spatial resolution solar Ca II H and K emission data obtained by the SUNRISE mission and building a model of other stars more active than the Sun
The magnetic field in the solar atmosphere exceeds the geomagnetic field strength by four orders of magnitude. It greatly influences the processes of energy transport within the solar atmosphere, and dominates the morphology of the solar chromosphere and corona. Kinetic energy from convective motions in the Sun can be efficiently stored in magnetic fields and subsequently released - to heat the solar corona to several million degrees or to blast off coronal mass ejections.